WO2014121943A1

WO2014121943A1 - Sizing die and method for producing a transmission control gear with a running toothing

Info

Publication number: WO2014121943A1
Application number: PCT/EP2014/000338
Authority: WO
Inventors: Anton Schmid; Mike Wegner
Original assignee: Sona Blw Präzisionsschmiede Gmbh
Priority date: 2013-02-07
Filing date: 2014-02-07
Publication date: 2014-08-14
Also published as: DE102013002043A1

Abstract

The invention relates to a method for producing a transmission control gear (6) with a running toothing (5) by forging a control gear blank and subsequently producing the finished running toothing, said method having the method steps of • a) completely forging the control gear (6) with a running toothing (5), which has a sizing allowance; and • b) cold forming the running toothing (6) using a sizing tool in order to precisely shape the tooth flanks. The invention further relates to a sizing die and a sizing caliper.

Description

Calibration die and method of making a geared shift gear with running serration

The invention relates to a gear ratchet wheel with running gear namely a method for producing the gear ratchet wheel in its entirety, its running toothing in particular and a Kalibriergesenk and a Kalibrierzange for producing the running gear according to the preambles of the independent claims 1, 3, 7 and 12th

In the production of gear-shift gears, especially for transmissions in motor vehicles, where it depends on the greatest smoothness and an adapted at least to the life of a motor vehicle life, the highest demands on the

To provide tooth form accuracy of the torque-transmitting gear teeth. For this reason, such running tooth systems have hitherto been produced ready for use in suitable milling centers, with the exception of a subsequent hardening process. Among other things, for cost reasons, generally preferable forming methods, e.g. forging is out of the question with regard to the high accuracy requirements for running splints; Their suitability is limited to gears with low demands on the tooth flank accuracy, such as on gear shifting or short gear teeth on gear wheels.

CONFIRMATION COPY In contrast, the present invention has the object, Laufverzahnungen, in particular to produce gear-shift gears without loss of quality and with less effort compared to machined Laufverzahnungen.

This object is achieved according to the features characterized by the above-mentioned independent claims.

In the method for producing a gear ratchet wheel with running gear, a green body of the ratchet wheel is first prepared by forging in a known manner. In this case, in one or more successive forging steps, the ratchet with

Progressive serration forged, with the running serration having a calibration allowance. This calibration allowance is matched to the others

Process step of cold forming of the running serration with a calibration tool for gene formation of the tooth flanks of the running serration. As is known, a calibration allowance between 0.07 and 0.10 mm is sufficient.

Thus, this method according to the invention is limited to process steps of forming namely the finish forging of the ratchet wheel with running teeth and the subsequent cold forming of the running toothing while avoiding any machining step. The main advantages of this method are that the processing time is considerably reduced by the cold forming process and, in particular, that the fiber-forming profile formed during the forging of the running teeth is retained in the area of the toothing. This results in a longer life of the ratchet wheel.

An additional requirement is to ensure a particularly high quality teeth in that the finished calibrated running gear is still surface hardened and ground. In this case, the running toothing is calibrated with a grinding allowance of approx. 0.15 mm.

Producing the running serration in the above method of manufacturing a gear ratchet wheel with running teeth requires the use of a suitable calibration tool, which allows the calibration of the interdental spaces in the high accuracy required for a running gear.

For this purpose, the invention proposes in a further embodiment of the above-explained method steps, that after the final forging of the Laufzerzahnung the gear-shifting wheel of the subsequent forming step takes place in a Kalibriergesenk means of a novel Kalibrierwerkzeugs, the moldings are pressed radially into the interdental spaces of LaufVerzahnung. It is provided that the mold parts of the calibration tool are each deformed elastically from a starting position into an end position of the forming process when pressed.

In a further embodiment of the invention, the mold parts are elastically deformed in each case against a stop of the Kalibriergesenks and cause by their shape shaping the forming of each one

Interdental space adjacent tooth flanks. Their final form achieved by this meets all the relevant accuracy requirements for running queries.

For this forming process by calibration, it is assumed that the finish-forged running serration has a calibration allowance enabling material transformation.

The calibration tool for the production of the running toothing is advantageously designed such that when closing the Kalibriergesenks in each interdental space of the Laufzerzahnung a molded part is pressed and that when opening the Kalibriergesenks the moldings are released within the interdental spaces, after which the finished ratchet wheel is removed from the calibration.

In a further embodiment according to the invention, a calibration die for producing a running toothing of a gearwheel from a forged raw material body of the ratchet wheel, comprising a calibration tool for forming the tooth flanks of the running gear of the ratchet wheel, an upper punch for closing the calibration, a Kalibriergesenk for receiving the Kalibrierwerkzeugs and a counter punch for opening the calibration, wherein the calibration tool is designed in the manner of a calibrating, which by Components of Kalibriergesenk is actuated.

As such, the calibrating pliers consist of individual mold parts which form the interdental spaces and which are connected to one another at one end such that together they form a closed molded body. With their other ends, the mold parts are unconnected, so that they retract when closing the die in the radial direction in the interdental spaces of the running. In this case, the smallest adjustment paths are managed within the scope of the elastic elongation of the molded parts.

The calibration tool is closed by applying the top of the calibration die to the top of the calibration tool. In this case, an upwardly widening outer cone of the peripheral surface of the calibrating pliers interacts with a correspondingly conical hollow shape of the calibrating die, so that the molded parts enter into the intermediate spaces of the running toothing.

To open the Kalibrierzange is inventively provided that an ejector, on which the Calibration tongs rests upwards until the molded parts lift off the tooth flanks.

To functionally ensure this lifting is provided in a further embodiment of the invention, that below the ratchet and within the Kalibrierzange a fixedly connected to a base plate stop body is centrally located on a stem a disc-shaped headboard as a stop for actuated by the ejection plate moldings of Kalibrierzange having.

In a further embodiment of the Kalibriergesenks is provided that the Kalibrierzange is pushed with the merged ends of your moldings on the stem of the stopper body.

A particular embodiment of a calibration pliers according to the invention, in particular for use in a calibrating die according to claim 7, is that the calibrating pliers are designed as a monolithic component which has a tubular collar on which all molded parts are connected separately next to each other, so that they together describe a mold whose surface corresponds to the running gear of a gear shift.

The molded parts are movable in the radial direction in the context of their elasticity, so they in their

Bottleneck which hurries the closed cali- speaks, describing exactly one of the running serrations enveloping mold.

As a material for such a highly stressed tool in the type of calibration caliper according to the invention, which is easy to work and has hard elastic properties, is preferably a highly alloyed tool steel.

In the following an embodiment of the invention will be described with reference to several drawing figures. It shows

Fig. 1 shows a cross section through a Kalibriergesenk with open and closed half

Fig. 2 shows an associated workpiece as gear ratchet wheel with Laufzerzahnung, in the side view

Fig. 3 is a Kalibrierzange the Kalibriergesenks in side view and

4, 5 and 6 are each a three-dimensional view of the calibrating forceps in a different spatial arrangement.

Fig. 1 shows an axial cross section through a Kalibriergesenk, the left half is shown as an open die, the right half as a closed die. When open die counter punch 1 is moved from its lower position (right half of the mold) according to arrow PI against the bottom of a base plate 2 of the calibration sink upwards. With the counter punch 1 ejector 3, of which several are provided distributed over the circumference, moved according to arrow P2 upwards. With their upper ends, they thereby cause the lifting of an ejector plate 4, so that a seated on the ejector 4 calibration pliers 7 triggers after completion of the calibration of the tooth flanks of a running serration 5 a Getriebeschaltrads 6.

Fig. 3 shows the fancy as a monolithic component te calibration pliers 7, which is attached to a common collar, according to the helical teeth of the barrel teeth 5 separated by separating cuts 9 10 molded parts. Due to the separating cuts 9, even if they are only of very small width, a limited mutual mobility of the molded parts 10 is made possible

When closing the die under load, ie press down with the upper punch 11 according to arrow P4, the mold parts 10 are retracted radially in the direction of the arrow P3 in the interdental spaces of the Laufverzahnung 5. This movement of the retraction of the moldings 10 takes place in accordance with the apparent in the drawing slight conicity of the outer circumference of the sizing 7 in the region of the formed by the moldings 10 above its collar 8 shaped body 22. The case in question nuswinkel W of the shaped body 22 is dependent on the width of the parting lines between the mold parts 10; it is preferably about 10 degrees, wherein it should be noted that self-locking of the molded parts 10 in the die is to be avoided as far as possible.

To ensure proper opening of the die, the mold parts 10 are moved upward as a result of the upward movement according to arrow P2 of the ejector plate 4, wherein they are supported inwardly against a circumferentially bevelled head portion 12 of a central stopper body 13.

Of the mold parts 10 connecting common collar 8 of the calibrating 7 is centrally fixed to an attached below the head part 12 stem 14 of the stopper body 13. The stopper 13 is by means of a threaded connector 15 which engages in a threaded bore of the base plate 2, fixed to this and thus the

Jointed. The stopper 13 thus serves on the one hand the fixation of the calibrating 7 in Kalibriergesenk; In addition, its head part 12 serves as

Stop for the mold parts 10 during the opening movement of the ejector 4, so that the mold parts 10 from the tooth flanks within the interdental spaces and from each other until the open position of the Kalibriergesenks shown in the left half of FIG. 1 is reached. In the representation of the open Gesenk (see left side of Fig. 1), the gear ratchet wheel 6 is drawn with LaufVerzahnung 5, the upper edge 23 corresponding to the lifting movement of the ejector 4 above the position of the upper edge 23 shown on the right side of FIG with the die closed, where it is flush with the tops of the adjoining die parts. These die parts are further components that are firmly connected to the base plate 2 of the calibration die, namely, interlocking from inside to outside, a pliers receptacle 16, a die cup 17 and a die casing 18. It goes without saying that the hollow shape of the inner circumference of the Pliers receptacle 16 corresponding to the outer cone W of the molding 22 of the caliper, ie

similarly conical, so that by lowering the upper punch 11 according to arrow P4 causing the calibration causing radial movement of the mold parts 10 according to arrow P3.

From Fig. 1 it is clear that the ratchet wheel 6 is held without further support within the mold parts 10 of the sizing 7. This applies to both the closed and the open die, which can be seen from the fact that below the lower edge 24 of the ratchet wheel 6, the interior appears on behind moldings 10, namely with the die closed as a narrow gap 19 (right half of the drawing) and at open die (left half of the drawing) as contrast significantly wider gap 20. In addition to the running toothing 5, the gear ratchet wheel 6 also includes a short toothing 21 see (FIGS. 1 and 2), which is arranged inside the running toothing 5 and protruding axially beyond this, in order to increase the rotational speeds of the running toothings to be coupled during switching operations synchronize and allow a bumpless switching.

Since the described calibration tool 7 is a novel calibration tool, in order to improve the spatial conception in FIGS. 4, 5 and 6, the calibration tool 7 is shown three-dimensionally in different spatial views. It is a monolithic one-piece component, which is composed of a narrow rohrför- shaped collar 8 connected thereto molding 22, which consists of individual moldings 10, separated by narrow separating cuts 9 from each other, but each connected in one piece with the collar 8 are. Such cuts are produced with extremely low

Cutting widths by means of electrical cutting methods, for example by lasers, wire erosion or the like.

The individual molded parts 10 extend in a bevel which corresponds to the running gear toothing 5 designed as helical toothing, so that a molded part 10 is provided per tooth space. FIGS. 4 and 5 clearly show the negative image 24 of the running toothing the inner side of the shaped body 22. The individual separating cuts 9 are each guided close to the collar 8 and end there each with a small bore 25th

In FIGS. 4 to 6, the molded parts 10 are in their unloaded starting position, as shown in the left half of FIG. Only by pressing on the upper punch 11, there is the mutual contact of the mold parts 10, which are extended with lowering of the upper punch 11 in the conical cavity of the forceps holder 16 increasingly radially into the interdental spaces of the running gear 5, where they cause the desired calibration. Because of the small forming depth during calibration, this activity, i. the operation of the calibration, carried out as part of the elastic deformation of the moldings 10.

Claims

claims

1. A method for producing a transmission ratchet wheel (6) with running toothing (5), by

Forging a green body of the ratchet wheel and subsequent generation of the finished running gear characterized by the steps a) finish forging the ratchet wheel (6)

Running serration (5) having a calibration allowance;

b) cold forming of the running serration (6) with a calibration tool for the gene formation of the tooth flanks of the running toothing (5).

2. The method according to claim 1

characterized,

that the finished calibrated running serration (5) with an allowance for subsequent grinding

will be produced.

3. Make a running toothing (5) for a

Gear ratchet wheel (6) by ready forging the Laufzerzahnung (5) and subsequent forming in a Kalibrierungsgesenk by means of a

Calibration tool whose moldings (10) are pressed radially into the interdental spaces of the Laufszahnung (5).

4. Making a Running Gear (5)

according to claim 3,

characterized,

that the shaped parts (10) of the calibration tool are each deformed elastically when pressed.

5. Producing a running toothing according to claim 4, characterized

that the moldings (10) each against a

Stop the calibration die are deformed.

6. Making a running toothing (5)

according to claim 3,

characterized,

that when closing the Kalibriergesenks in each interdental space, a molded part (10) is pressed and that when opening the Kalibriergesenks the moldings (10) are released within the interdental spaces, after which the switching wheel (6) the

Calibration tool is removed.

7. Kalibriergesenk for producing a

Running toothing (5) of a gear ratchet wheel (6) from a forged green body of the ratchet wheel (6) comprising a Kalibrierwerkzeugs and a counter punch (19) for opening the

Calibration tool,

characterized,

that the calibration tool as Kalibrierzange (7) of individual forming the interdental spaces Molded parts (10) is formed

in that the mold parts (10) are connected together at one end such that they together form a closed mold body (22), and

in that the mold parts (10) are unconnected at their other ends, such that they engage in the radial direction when the die is closed

Interdental spaces of running toothing (5)

retract.

8. Kalibriergesenk according to claim 7,

characterized,

for closing the calibration pliers (7) under the action of the upper punch (11) on their

Top, the moldings (10) via an upwardly widening outer cone (W) of their

Peripheral surface in cooperation with a

correspondingly conical hollow shape of the

Insert the calibration joint into the interdental spaces of the running toothing (5).

9. Kalibriergesenk according to claim 7,

characterized,

that for opening the calibration pliers (7) after

Lifting off the upper punch (11), an ejector plate (4) on which the Kalibrierzange (7) rests, moves upward until the moldings (10) lift off the tooth flanks.

10. Kalibriergesenk according to claim 7,

characterized,

that below the ratchet wheel (6) and within the Kalibrierzange (7) a fixed with a

Base plate (2) connected to the stop body (13) is centrally arranged on a stem (14) has a disc-shaped head part (12) as a stop for the ejector (4) actuated moldings (10) of the Kalibrierzange (7).

11. Kalibriergesenk according to claim 10,

characterized,

the calibration pliers (7) with the connected ends of their molded parts (10) are pushed onto the stem (14) of the stop body (13).

12. Calibration pliers (7), in particular for use in a Kalibriergesenk according to claim 7,

characterized,

in that it is designed as a monolithic component which has a tubular collar (8) on which all molded parts (10) are separated

are connected side by side so that together they describe a mold whose

Surface of those of the running toothing (5) corresponds to a transmission ratchet wheel (6).